/*
 * Copyright (C) 2011 The Android Open Source Project
 * Copyright (C) 2011 Jake Wharton
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.lab.widget.pager;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.HorizontalScrollView;
import android.widget.LinearLayout;

import com.cuitrip.business.tripservice.ui.IconTextView;
import com.cuitrip.service.R;
import com.lab.utils.DisplayUtil;
import com.viewpagerindicator.IconPagerAdapter;
import com.viewpagerindicator.PageIndicator;

import static android.graphics.Paint.ANTI_ALIAS_FLAG;
import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
import static android.view.ViewGroup.LayoutParams.WRAP_CONTENT;

/**
 * This widget implements the dynamic action bar tab behavior that can change
 * across different configurations or circumstances.
 */
public class TabPageIndicator extends HorizontalScrollView implements PageIndicator {
    /**
     * Title text used when no title is provided by the adapter.
     */
    private static final CharSequence EMPTY_TITLE = "";
    private final IcsLinearLayout mTabLayout;
    private Runnable mTabSelector;
    private ViewPager mViewPager;
    private OnPageChangeListener mListener;
    private boolean isShowBottomLine;
    private int mMaxTabWidth;
    private int mSelectedTabIndex;
    private OnTabReselectedListener mTabReselectedListener;
    private final OnClickListener mTabClickListener = new OnClickListener() {
        public void onClick(View view) {

            if (view instanceof ITabView) {
                ITabView tabView = (ITabView) view;
                final int oldSelected = mViewPager.getCurrentItem();
                final int newSelected = tabView.getIndex();
                mViewPager.setCurrentItem(newSelected,false);
                if (oldSelected == newSelected && mTabReselectedListener != null) {
                    mTabReselectedListener.onTabReselected(newSelected);
                }
            }


        }
    };

    public TabPageIndicator(Context context) {
        this(context, null);
    }

    public TabPageIndicator(Context context, AttributeSet attrs) {
        this(context, attrs, R.attr.tabPageIndicatorStyle);
    }

    public TabPageIndicator(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.TabPageIndicator, defStyle, 0);
        isShowBottomLine = a.getBoolean(R.styleable.TabPageIndicator_show_bottom_line, true);
        a.recycle();
        setHorizontalScrollBarEnabled(false);

        mTabLayout = new IcsLinearLayout(context, R.attr.vpiTabPageIndicatorStyle);
        addView(mTabLayout, new ViewGroup.LayoutParams(WRAP_CONTENT, MATCH_PARENT));
    }

    public void setOnTabReselectedListener(OnTabReselectedListener listener) {
        mTabReselectedListener = listener;
    }

    @Override
    public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
        final boolean lockedExpanded = widthMode == MeasureSpec.EXACTLY;
        setFillViewport(lockedExpanded);

        final int childCount = mTabLayout.getChildCount();
        if (childCount > 1 && (widthMode == MeasureSpec.EXACTLY || widthMode == MeasureSpec.AT_MOST)) {
            if (childCount > 2) {
                mMaxTabWidth = (int) (MeasureSpec.getSize(widthMeasureSpec) * 0.4f);
            } else {
                mMaxTabWidth = MeasureSpec.getSize(widthMeasureSpec) / 2;
            }
        } else {
            mMaxTabWidth = -1;
        }

        final int oldWidth = getMeasuredWidth();
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        final int newWidth = getMeasuredWidth();

        if (lockedExpanded && oldWidth != newWidth) {
            // Recenter the tab display if we're at a new (scrollable) size.
            setCurrentItem(mSelectedTabIndex);
        }
    }

    private void animateToTab(final int position) {
        final View tabView = mTabLayout.getChildAt(position);
        if (mTabSelector != null) {
            removeCallbacks(mTabSelector);
        }
        mTabSelector = new Runnable() {
            public void run() {
                final int scrollPos = tabView.getLeft() - (getWidth() - tabView.getWidth()) / 2;
                smoothScrollTo(scrollPos, 0);
                mTabSelector = null;
            }
        };
        post(mTabSelector);
    }

    @Override
    public void onAttachedToWindow() {
        super.onAttachedToWindow();
        if (mTabSelector != null) {
            // Re-post the selector we saved
            post(mTabSelector);
        }
    }

    @Override
    public void onDetachedFromWindow() {
        super.onDetachedFromWindow();
        if (mTabSelector != null) {
            removeCallbacks(mTabSelector);
        }
    }

    private void addImageTab(int index, CharSequence text, int drawableRes, boolean isShowRedPoint) {
        if (getContext() == null) {
            return;
        }

        ImageTabView tabView = new ImageTabView(getContext());
        tabView.setTabText(text);
        tabView.setTabImageResource(drawableRes);
        tabView.setIndex(index);
        tabView.setmMaxTabWidth(mMaxTabWidth);
        tabView.setFocusable(true);
        tabView.setOnClickListener(mTabClickListener);
        tabView.setUnRead(isShowRedPoint);
        mTabLayout.addView(tabView, new LinearLayout.LayoutParams(0, MATCH_PARENT, 1));
    }

    private void addTextTab(int index, CharSequence text) {
        if (getContext() == null) {
            return;
        }


        final TabView tabView = new TabView(getContext(), isShowBottomLine);
        tabView.mIndex = index;
        tabView.setFocusable(true);
        tabView.setGravity(Gravity.CENTER);
        tabView.setOnClickListener(mTabClickListener);
        tabView.setText(text);

        mTabLayout.addView(tabView, new LinearLayout.LayoutParams(0, MATCH_PARENT, 1));
    }

    private void addTab(int index, CharSequence text, String iconText) {
        if (getContext() == null) {
            return;
        }

        LogoTabView tabView = new LogoTabView(getContext());
        tabView.setTabText(text);
        tabView.setTabLogo(iconText);
        tabView.setIndex(index);
        tabView.setmMaxTabWidth(mMaxTabWidth);
        tabView.setFocusable(true);
        tabView.setOnClickListener(mTabClickListener);

        mTabLayout.addView(tabView, new LinearLayout.LayoutParams(0, MATCH_PARENT, 1));
    }

    @Override
    public void onPageScrollStateChanged(int arg0) {
        if (mListener != null) {
            mListener.onPageScrollStateChanged(arg0);
        }
    }

    @Override
    public void onPageScrolled(int arg0, float arg1, int arg2) {
        if (mListener != null) {
            mListener.onPageScrolled(arg0, arg1, arg2);
        }
    }

    @Override
    public void onPageSelected(int arg0) {
        setCurrentItem(arg0);
        if (mListener != null) {
            mListener.onPageSelected(arg0);
        }
    }

    @Override
    public void setViewPager(ViewPager view) {
        if (mViewPager == view) {
            return;
        }
        if (mViewPager != null) {
            mViewPager.setOnPageChangeListener(null);
        }
        final PagerAdapter adapter = view.getAdapter();
        if (adapter == null) {
            throw new IllegalStateException("ViewPager does not have adapter instance.");
        }
        mViewPager = view;
        view.setOnPageChangeListener(this);
        notifyDataSetChanged();
    }

    public void notifyDataSetChanged() {
        mTabLayout.removeAllViews();
        PagerAdapter adapter = mViewPager.getAdapter();
        IconPagerAdapter iconAdapter = null;
        CustomPageAdapter customPageAdapter = null;
        ImagePageAdapter imagePageAdapter = null;
        if (adapter instanceof IconPagerAdapter) {
            iconAdapter = (IconPagerAdapter) adapter;
        }
        if (adapter instanceof CustomPageAdapter) {
            customPageAdapter = (CustomPageAdapter) adapter;
        }
        if (adapter instanceof ImagePageAdapter) {
            imagePageAdapter = (ImagePageAdapter) adapter;
        }

        final int count = adapter.getCount();
        for (int i = 0; i < count; i++) {
            CharSequence title = adapter.getPageTitle(i);
            if (title == null) {
                title = EMPTY_TITLE;
            }
            if (iconAdapter != null) {
                int iconResId = iconAdapter.getIconResId(i);
//                addTextTab(i, iconResId);
            }
            if (imagePageAdapter != null) {
                int drawable = imagePageAdapter.getIconImage(i);
                addImageTab(i, title, drawable, imagePageAdapter.isShowRedPoint(i));
            } else if (customPageAdapter != null) {
                String iconText = customPageAdapter.getIconText(i);
                addTab(i, title, iconText);
            } else if (adapter != null) {
                CharSequence text = adapter.getPageTitle(i);
                addTab(i, title, null);
            }

        }
        if (mSelectedTabIndex > count) {
            mSelectedTabIndex = count - 1;
        }
        setCurrentItem(mSelectedTabIndex);
        requestLayout();
    }

    @Override
    public void setViewPager(ViewPager view, int initialPosition) {
        setViewPager(view);
        setCurrentItem(initialPosition);
    }

    @Override
    public void setCurrentItem(int item) {
        if (mViewPager == null) {
            return;
//            throw new IllegalStateException("ViewPager has not been bound.");
        }
        mSelectedTabIndex = item;
        mViewPager.setCurrentItem(item, false);

        final int tabCount = mTabLayout.getChildCount();
        for (int i = 0; i < tabCount; i++) {
            final View child = mTabLayout.getChildAt(i);
            final boolean isSelected = (i == item);
            child.setSelected(isSelected);
            if (isSelected) {
                animateToTab(item);
            }
        }
    }

    @Override
    public void setOnPageChangeListener(OnPageChangeListener listener) {
        mListener = listener;
    }

    /**
     * Interface for a callback when the selected tab has been reselected.
     */
    public interface OnTabReselectedListener {
        /**
         * Callback when the selected tab has been reselected.
         *
         * @param position Position of the current center item.
         */
        void onTabReselected(int position);
    }

    public interface ITabView {

        public int getIndex();

        public void setIndex(int index);
    }

    public interface CustomPageAdapter {
        public String getIconText(int position);
    }

    public interface ImagePageAdapter {
        public int getIconImage(int position);

        public boolean isShowRedPoint(int index);
    }

    private class TabView extends IconTextView implements ITabView {
        private final Paint mCirclePaintFill = new Paint(ANTI_ALIAS_FLAG);
        private int mIndex;
        private float defaultRadius;
        private boolean isRed;
        private float paddingLength = 0;

        public TabView(Context context, boolean isShowBottomLine) {
            super(context, null, R.attr.vpiTabPageIndicatorStyle);
            if (!isShowBottomLine) {
                //FIXME WTF 为什么背景是走代码逻辑的，而不是走style
                setBackgroundResource(R.color.transparent);
            }
            mCirclePaintFill.setStyle(Paint.Style.FILL);
            mCirclePaintFill.setColor(getResources().getColor(R.color.ct_red));
            defaultRadius = DisplayUtil.dip2px(2);
            paddingLength = DisplayUtil.dip2px(3);
            setMaxLines(3);
        }

        @Override
        public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);

            // Re-measure if we went beyond our maximum size.
            if (mMaxTabWidth > 0 && getMeasuredWidth() > mMaxTabWidth) {
                super.onMeasure(MeasureSpec.makeMeasureSpec(mMaxTabWidth, MeasureSpec.EXACTLY),
                        heightMeasureSpec);
            }
        }

        @Override
        protected void onDraw(Canvas canvas) {
            super.onDraw(canvas);
            if (isRed) {
                canvas.save();
                float tWidth = getPaint().measureText(getText().toString());
                float width = getWidth();
                float startX = width / 2 + tWidth / 2 + paddingLength;
                float startY = getHeight() / 2 - getTextSize() / 2 + defaultRadius;
                canvas.drawCircle(startX, startY, defaultRadius, mCirclePaintFill);
                canvas.restore();
            }
        }

        public void setRed(boolean isRed) {
            this.isRed = isRed;
        }

        public int getIndex() {
            return mIndex;
        }

        public void setIndex(int index) {
            this.mIndex = index;
        }
    }

}
